单项选择题

Export of handicraft products is the mainstay of the county’s economy（）

A. rich resources
B. primary concern
C. only source
D. main support

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单项选择题
Next time you have a problem, think about how you can improve the situation instead of ______ all the negative aspects.
A. dwelling on
B. counting on
C. barking on
D. touching on
单项选择题
He didn’t notice me in the crowd; but he spotted my sister who was（）because of her red hair

A. conscious
B. conspicuous
C. dim
D. conscientious
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